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Method of manufacuring grain-refined aluminum-zinc-magnesium-copper alloy sheet

a technology of aluminum zinc and copper alloy, which is applied in the field of manufacturing a grain-refined aluminumzincmagnesiumcopper alloy sheet, can solve the problems of high cost structure of high-strength aluminum sheet currently manufactured, difficulty in controlling the size of crystallization phase and inclusions, and deviation in the size of dissolved elements, so as to reduce processing time and cost, improve the strength-ductility balance including elongation of aluminum sheet manufactured by the above manufacturing method, and reduce processing

Active Publication Date: 2015-04-30
KOREA INST OF MATERIALS SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method of manufacturing an aluminum-zinc-magnesium-copper alloy sheet using twin-roll casting, which may reduce processing time and cost. The sheet is then subjected to warm rolling, cold rolling, and heat treatment to maximize grain refinement and homogenization, resulting in improved elongation. The strength-ductility balance is significantly improved, making the aluminum sheet suitable for lightweight vehicle parts and structural material.

Problems solved by technology

However, a high-strength aluminum sheet currently manufactured has a high cost structure because the sheet is manufactured through complex processes, such as a heat treatment after ingot casting, hot rolling, and cold rolling, and the control of the sizes of crystallization phases and inclusions may be difficult because the ingot is cast in the form of a large slab.
However, with respect to twin-roll casting of high-alloyed aluminum alloy, a deviation in the size of dissolved elements and precipitates between a surface portion and a center portion of a sheet may occur due to the difference in cooling rates, and this causes a microstructural inhomogenization which can deteriorate mechanical properties of the sheet during a post-processing heat treatment.
However, in the case that an aluminum alloy is prepared by the above manufacturing method, a degree of improving elongation may be insignificant.

Method used

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  • Method of manufacuring grain-refined aluminum-zinc-magnesium-copper alloy sheet

Examples

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example 1

[0086]Step 1: A horizontal-type twin-roll caster including a cooling water line was used to manufacture an aluminum alloy sheet. Twin rolls having a diameter of 300 mm were used in the horizontal-type twin-roll caster.

[0087]An aluminum alloy used was a commercial alloy having the same composition as a commercial AA7075 aluminum alloy. After melting the aluminum alloy at 740° C., an Al-5Ti-1B alloy was added as a grain refiner and completely melted. Then, a degassing treatment was performed by injecting argon gas at 730° C. for 10 minutes.

[0088]An aluminum-zinc-magnesium-copper alloy melt prepared at 680° C. was introduced into a tundish formed of a ceramic board having a width of 150 mm. For twin-roll casting, the molten metal was allowed to flow from a melting furnace to the tundish, and, after being introduced into the inlet of the tundish, the molten metal was allowed to be transferred to the surface of the rotating rolls. The molten metal was rapidly solidified by being in conta...

example 2

[0094]An aluminum alloy sheet was manufactured in the same manner as in Example 1 except that rolling was repeatedly performed to reduce the thickness of the aluminum alloy sheet subjected to the primary rolling in step 3 of Example 1 by 40% so as to have a thickness of 1.2 mm.

example 3

[0095]An aluminum alloy sheet was manufactured in the same manner as in Example 1 except that rolling was repeatedly performed to reduce the thickness of the aluminum alloy sheet subjected to the primary rolling in step 3 of Example 1 by 60% so as to have a thickness of 0.8 mm.

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Abstract

Provided is a method of manufacturing a grain-refined aluminum-zinc-magnesium-copper alloy sheet, including manufacturing an aluminum alloy sheet from an aluminum-zinc-magnesium-copper alloy melt by twin-roll strip casting, primarily rolling the aluminum alloy sheet manufactured in step 1, cold rolling the aluminum alloy sheet manufactured in step 2, and performing a heat treatment on the aluminum alloy sheet manufactured in step 3, thereby reducing processing time and cost by using twin-roll casting. Since grain refinement and homogenization of the sheet manufactured by the twin-roll casting are maximized by sequentially performing warm rolling, cold rolling, and a heat treatment on the sheet, elongation may be improved.

Description

RELATED APPLICATIONS[0001]This application is a US Bypass of PCT / KR2013 / 010575, filed on Nov. 20, 2013, which claims benefit of KR 10-2013-0127075, filed Oct. 24, 2013. Each of these applications is herein incorporated by reference in their entirety for all purposes.FIELD OF THE INVENTION[0002]The present disclosure relates to a method of manufacturing a grain-refined aluminum-zinc-magnesium-copper alloy sheet, and more particularly, to a method of manufacturing a grain-refined aluminum-zinc-magnesium-copper alloy sheet, in which an aluminum-zinc-magnesium-copper alloy sheet is formed by twin-roll strip casting and a post-processing heat treatment including cold rolling is then performed.BACKGROUND OF THE INVENTION[0003]Recently, in line with the reinforcement of environmental regulations at home and abroad, material industry as well as automobile industry is searching for a solution for fuel economy as energy saving and pollution prevention measures.[0004]In general, as a solution ...

Claims

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Application Information

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IPC IPC(8): C22F1/053B22D11/00B22D11/06C22C21/10
CPCC22F1/053B22D11/0622B22D11/003C22C21/10
Inventor KIM, HYOUNG-WOOKLEE, YUN-SOOLIM, CHA YONGCHO, JAE HYUNG
Owner KOREA INST OF MATERIALS SCI